Opposed stone mandrel



Dec. 25, 1951 J, s u 2,580,328

OPPOSED STONE MANDREL Filed Feb. 15, 1949 2 Sl- EETSSHEET l 9 J. SUNNEN 2,580,328

I OPPOSED STONE MANDREL Filed Feb. 15, 1949 2 SHEETSSHEET 2 ATTORNEY Patented Dec. 25, 1951 UNITED STATES ATENT OFF ICE OPPOSED STONE MANDREL Joseph S'unnen, Clayton, Mo.

Application February 15, 1949,. Serial Nc..7-6,5.93

beingso constructed and arranged that each of the hones is directly associated with a solid back wallpartly defining a hone receiving recess in the mandrel body.

Another object of the invention is to provide a. floating action for the stones of a double wedge mandrel, in which the association of the parts is such as, to, provide parallel surface contact for the individual hones against surfaces provided in the mandrel body and to arrange the double wedges so as to maintain the hones in their proper, association at all times.

Another object of the inventionis to provide a honebody structure in which flat inwardly facing solid walls are provided for constant association with the several hones, the fiat surfaces lying in parallel planes to minimize the Work required in securing desired adjustments and to insure a rigid working assembly when the associated wedges are assembled.

A further object of the invention is the provision of separate wedges for the separate hones; the wedges being arranged intermediate the hones and due to their assembly forming with the hones I a floating arrangement normally tending to maintain the, parts in the respective positions during adjustment and operation.

These and other objects are obtained by the structure shown in the drawings forming a part of this specification, wherein like characters of reference designate corresponding parts throughout the several views, in which:

Fig. 1 is a longitudinal, transverse. section through a hone assembly;

Fig. 2isa longitudinal vertical section through the hone assembly showing the hones retracted;

Fig. 3 is a transverse section on line 3--3'o-f Fig. 2;

Fig. 4 is a view. similar to Fig- 2 showingthe wedge assembly moved to a position to advance the hones to. their working position;

Fig. 5 is a transverse section on line 5.'5 of Fig.4; and

Fig. 6 is an exploded view. showing the wedge and hone parts.

The present mandrel is designed for use in a machine of the type shown in my prior Patent No. 2,377,588,.patente'd June 5, 1945, and basically involves the principle of wedge expansion for the 2. hone elements as shown in my prior Patents No. 2,421,170 and No. 2,376,850 as well as others. The body of the mandrel may be formed as an integral structure, although illustrated in the present case as fabricated by the use of the head element l, which is designed to be chucked in a honing machine, the hone containing portion 2,

and the tubular connectingbody portion 3. The chucking head i has a reduced outer extension 4 for, receiving one end of; the tubular body 3, while the hone carrying portion 2' has the reduced inner, neck 5 which receives theouter end of the tubular,

connecting body 3. As previously stated, the entiremandrel body may be. formed'as an integral structure or may, to facilitate manufacture,

be. fabricated asv illustrated, it being ample. in either instance toprovide an axialjbore in which the operating Wedges andv associated. parts are arranged. The hone carrying body portion 2 is shown. as substantially enlargedv in. diameter. with respect to the chucking head i and is formed with an elongated rectangular transverse slot defined by offset side walls 6 and end walls 7 which receive and guide the hones. The transverse hone receiving slot is formed so that it will medially intersect the axis of the longitudinal bore in which the operating mechanism is arranged, this slot which receives the hones being of greater widththan the axialbore in order that the hone elements may be positioned laterally of the wedge operating mechanism, and in. the hone chambers indicated by referencecharacters 8 and. 9 providedby the structure. rying section of the mandrel assembly is shown as provided with ample solidv wall portions towall portionsfor guidingv the lateral faces of. the

twoactuatingwedgesbeing indicated bythe reference characters 2 and, 2", it being remembered that the wedges shift longitudinally during their.

operation and thus the guide walls Z and-Z must be designed to provide the proper supporting structure, atall-positionsof the wedge operation. The hone carrying portion. 2 of the mandrel is grooved at its outer surface at diametrically opposite points IDI0 so thatguides ll may be positioned intermediate, each of the radially ad justable hones received in the transverse grooves.

Referringnow to the exploded view in Fig. 6 itwillbe seen that the two hone carrying elements are each provided with vertical walls M and horizontal walls l5, the vertical walls l4 being provided with flat parallel inner and outer faces which abut and engage the outer faces of The hone car-- the wedge elements and the inner faces 6 of the transverse slot. The inner faces of the vertical walls l4 are provided with angularly arranged ribs [6 which lie in parallel planes for cooperation with slots provided in the wedges, as will be hereinafter described. The horizontal walls of the hone carrying elements have their outer angular faces I1 each carrying the hone elements l8 which are affixed thereto by a suitable adhesive or other means as is conventional in the art. It will be appreciated that the angular faces I! may be otherwise disposed or constructed to present the hones [8 in a manner to procure the desired honing operation.

The wedges i9 and 20 are formed of elongated plates having flat parallel outer faces which engage and lie flush with respect to the faces 2 and 2 of the axial bore in the hone carrying portion of the mandrel. The wedge plates I9 and 20 are formed of a suitable steel alloy to resist wear and permit proper machining and are associated with the operating rod 2| which extends into and through the chucking head I of the mandrel assembly. The operating rod is formed with the usual hooked head 22 at its outer end for engagement with the operating structure provided for in my Patent No. 2,377,588. Obviously this engaging extremity 22 may be modified to permit association with any suitable operating element. The inner end of the operating rod 21 is defined by the oppositely arranged shoulders 23 which are formed by the inner recesses 24 and the outer reduced extremity 25 and receives the hooked end portions 25 of the inner ends of the wedge elements 18 and 2B, which latter are secured by a pivot pin against the Sl'lOllldSIS 23 and associated parts of the operating rod by means of the rivet or pin 21. It will be noted that the connection between the wedges l9 and 20 and the operating rod 2! is so arranged that the connection is at the longitudinal center of the wedges to provide for direct draft on the structure, this being best shown in Fig. 6. This connection betweenthe wedges l9 and 20 and the operating rod 2! normally spaces the wedges l9 and 20 and to maintain a parallel association between the wedges there is connected to the inner side at the outer end portion of one of the wedges a spacing plate 28, this spacing plate being of such a length as to properly position the wedges inparallel relationship and to maintain them in compact association with the wedges and to further maintain the wedges in compact relationship with their respective guide walls 6. The spacing of the wedges l9 and 28 is such that they will snugly engage the guide walls 2 and 2 in the ends of the tranverse hone slot. The length of the space plate 28 is such that it extends substantially beyond the ends of the transverse wedge slot so that the wedges at their point of association with the hones is in substance a solid structure at all positions during the operation of the parts. Thus there is provided a floating structure in which all of the parts have more or less fredom of movement but due to their assembly and relationship comprehend a compact honing structure in which more than substantial surface area is provided by the parts to maintain them in proper position under operation in which the drag and friction of the honing operation may be such as to tend to cause distortion.

The outer faces of the wedges are provided With parallel angular grooves of the general type shown in my prior patents heretofore noted, these grooves being suitably spaced and of such dimensions as to properly engage the ribs or lugs l6 of the inner faces of the vertical walls of the hone carrying elements whereby movement of the wedges will cause an expansion and contraction of the hone carrying elements to procure the necessary adjustment of the latter. The slots are indicated by reference character 32 and are through slots and formed to extend from edge to edge of the wedges, this arrangement providing for the release and interchange of the hone carriers and permitting their expulsion from the assembly by proper movement of the operating rod 2| in an outward direction as indicated in Fig. 4. The retracted position of the hone carriers is indicated in Fig. 2 and by comparison of the drawings of Figs. 2 and 4 the position of the hone carriers in the slots 32 at retracted and operating positions is clearly indicated.

By the foregoing structure a mandrel has been provided which is capable of manufacture with a minimum amount of machining and at the same time the parts are so constructed and arranged as to provide a mechanism which will facilitate convenient operation and adjustment and which at the same time presents the hones in such a manner and under all circumstances that they are incapable of chattering or distortion. In the structure shown a nose piece 30 is provided at the end of the mandrel, this nose piece being beveled to facilitate insertion in the bore which is to be honed.

I claim:

In an opposed stone type honing mandrel, a mandrel body including a chuck end and a stone carrying portion, said mandrel being formed throughout with an axial bore including spaced parallel wall portions, said stone carrying portion of said mandrel being formed with a transverse opening intersecting said axial bore inwardly of its outer end, the transverse opening being relatively wide to form stone carrying recesses at each side of the axial bore, a pair of parallel spaced Wedge bars in the bore of the mandrel, an operating bar pivotally connected to the inner end of each wedge bar for limited movement, honing stone carriers arranged in said recesses and including portions operably associate with said wedge bars to cause their radial movement upon shifting of said wedge bars in said bore, and means for retaining said wedge bars in parallel alinement when in position to engage said honing stones, said last named means including a plate carried by one of said wedge bars and having portions extending beyond the end walls defining said transverse opening.

JOSEPH SUNNEN.

REFERENCES CITED UNITED STATES PATENTS Name Date Sunnen June 6, 1944 Number 

